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參數資料
| 型號： | AD8130ARM-REEL3 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low-Cost 270 MHz Differential Receiver Amplifiers |
| 中文描述： | 低成本270 MHz的差分接收器放大器 |
| 文件頁數： | 21/28頁 |
| 文件大小： | 510K |
| 代理商： | AD8130ARM-REEL3 |
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REV. 0
AD8129/AD8130
–21–
APPLICATIONS
Basic Gain Circuits
The gain of the AD8129/AD8130 can be set with a pair of feed-
back resistors. The basic configuration is shown in Figure 5.
The gain equation is the same as that of a conventional op amp:
G = 1 + R
F
/R
G
. For unity gain applications using the AD8130,
R
F
can be set to zero (short circuit), and R
G
can be removed.
(See Figure 6.) The AD8129 is compensated to operate at gains
of 10 and higher, so shorting the feedback path to obtain unity
gain will cause oscillation.
R
F
R
G
0.1 F
10 F
–
V
V
OUT
+V
0.1 F
10 F
V
IN
–
V
S
PD
+V
S
+
+
AD8129/
AD8130
Figure 5. Basic Gain Circuit: V
OUT
= V
IN
(1 + R
F
/R
G
)
0.1 F 10 F
–
V
V
OUT
+V
0.1 F
10 F
V
IN
AD8130
–
V
S
PD
+V
S
+
+
Figure 6. An AD8130 with Unity Gain
The input signal can be applied either differentially or single-
endedly—all that matters is the magnitude of the differential
signal between the two inputs. For single-ended input applica-
tions, applying the signal to the +IN with –IN grounded will
create a noninverting gain, while reversing these connections
will create an inverting gain. Since the two inputs are high-
impedance and matched, both of these conditions will provide
the same high input impedance. Thus, an advantage of the
active feedback architecture is the ability to make a high-input-
impedance, inverting op amp. If conventional op amps are used,
a high impedance buffer followed by an inverting stage is needed.
This requires two op amps.
Twisted-Pair Cable, Composite Video Receiver with Equal-
ization Using an AD8130
The AD8130 has excellent common-mode rejection at its inputs.
This makes it an ideal candidate for a receiver for signals that
are transmitted over long distances on twisted-pair cables. Cat-
egory 5 type cables are now very common in office settings and
are extensively used for data transmission. These same cables
can also be used for the analog transmission of signals like video.
These long cables will pick up noise from the environment they
pass through. This noise will not favor one conductor over an-
other, and will therefore be a common-mode signal. A receiver
that rejects the common-mode signal on the cable can greatly
enhance the signal-to-noise ratio performance of the link.
The AD8130 is also very easy to use as a differential receiver,
because the differential inputs and the feedback inputs are
entirely separate. This means that there is no interaction of the
feedback network and the termination network as there would
be in conventional op amp-type receivers.
Another issue to be dealt with on long cables is the attenuation
of the signal at longer distances. This attenuation is a function of
frequency and increases as roughly as the square root of frequency.
For good fidelity of video circuits, the overall frequency response
of the transmission channel should be flat versus frequency. Since
the cable attenuates the high frequencies, a frequency-selective
boost circuit can be used to undo this effect. These circuits
are called equalizers.
An equalizer uses frequency-dependent elements (Ls and Cs) in
order to create a frequency response that is the opposite of the
rest of the channel’s response in order to create an overall flat
response. There are many ways to create such circuits, but a
common technique is to put the frequency-selective elements in
the feedback path of an op amp circuit. The AD8130 in particu-
lar makes this easier than other circuits, because, once again, the
feedback path is totally independent of the input path and there
is no interaction.
The circuit in Figure 7 was developed as a receiver/equalizer for
transmitting composite video over 300 m of Category 5 cable. This
cable has an attenuation of approximately 20 dB at 10 MHz
for 300 m. At 100 MHz, the attenuation is approximately
60 dB. (See Figure 8.)
R
F
1k
0.1 F
10 F
–
V
V
OUT
+V
0.1 F
10 F
V
IN
R1
100
R
G
499
–
V
S
PD
+V
S
+
+
C1
200pF
AD8130
100
Figure 7. An Equalizer Circuit for Composite Video
Transmission over 300 m of Category 5 Cable
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PDF描述 |
|---|---|
| AD8130ARM-REEL72 | Low-Cost 270 MHz Differential Receiver Amplifiers |
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| AD8129-EVAL | Low-Cost 270 MHz Differential Receiver Amplifiers |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8130ARM-REEL7 | 制造商:Analog Devices 功能描述:SP Amp DIFF Receiver Amp Single 制造商:Analog Devices 功能描述:SP Amp DIFF Receiver Amp Single ±12.6V/25.2V 8-Pin MSOP T/R |
| AD8130ARM-REEL72 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost 270 MHz Differential Receiver Amplifiers |
| AD8130ARMZ | 功能描述:IC AMP DIFF LN LDIST 40MA 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產品培訓模塊:Differential Circuit Design Techniques for Communication Applications 標準包裝:1 系列:- 放大器類型:RF/IF 差分 電路數:1 輸出類型:差分 轉換速率:9800 V/µs 增益帶寬積:- -3db帶寬:2.9GHz 電流 - 輸入偏壓:3µA 電壓 - 輸入偏移:- 電流 - 電源:40mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):3 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VQFN 裸露焊盤，CSP 供應商設備封裝:16-LFCSP-VQ 包裝:剪切帶 (CT) 產品目錄頁面:551 (CN2011-ZH PDF) 其它名稱:ADL5561ACPZ-R7CT |
| AD8130ARMZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
| AD8130ARMZ-REEL | 功能描述:IC AMP DIFF LN LDIST 40MA 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數:2 輸出類型:滿擺幅 轉換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
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